-
What they are being charged from/with.
http://www.legislation.gov.uk/ukpga/Vict/24-25/100/contents
What death by other roadusers is charged from/with.
http://www.legislation.gov.uk/ukpga/1988/52/contents
Just take a look at the other charges in that list, a driver is grouped with those who have a brake light out or other small motoring offences while the cyclist is being grouped with "murder" "child stealing" "shooting" "threats to kill" the list goes on and on.
All that comes to mind is "why aren't drivers charged for that same thing?".